import re

from bs4 import BeautifulSoup

html_doc = """<html><head><title>The Dormouse's story</title></head> 
<body> 
<p class="title"><b>The Dormouse's story</b></p> 
<p class="story">Once upon a time there were three little sisters; 
and their names were 
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>, 
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and 
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; 
 and they lived at the bottom of a well.</p> 
 <p class="story">...</p> 
 """

soup = BeautifulSoup(html_doc, features='lxml')

res1 = soup.select('.sister')
print(res1)

res2 = soup.select("title")
print(res2)

res3 = soup.select("#link1")
print(res3)

res4 = soup.select('[href="http://example.com/elsie"]')
print(res4)

res5 = soup.select('a#link1')
print(res5)

res6 = soup.select('a[href="http://example.com/elsie"]')
print(res6)

for element in soup.select('a[href="http://example.com/elsie"]'):
    print(element.get_text())